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Title: A critical evaluation of the use of Spent Mushroom Compost Ash (SMCA) in cement based materials
Author: Russell, Mark Ivan
ISNI:       0000 0004 2725 1555
Awarding Body: Queen's University Belfast
Current Institution: Queen's University Belfast
Date of Award: 2011
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In this research spent mushroom compost ash (SMCA), the incinerated product of spent mushroom compost (SMC), was investigated for use in Portland cement (PC) based materials. Characterisation studies found that SMCA contained, among other things, calcium and alkali sulphates. The sulphate content within SMCA was utilised in this investigation as: (A) a set retarder, replacing calcium sulphate in PC and (B) a sulphate activator of pulverised fuel ash (PF A) in PF AlPC blends. Results demonstrated that SMCA was effective at both retarding set in PC and chemically activating PF A in PF AlPC blends. Moreover, in both applications, mineralogical changes and compressive strength results during the fIrst 24 hours of hydration indicated that the presence of SMCA in PC accelerated the early hydration and strength development (lday) compared to PC without SMCA. However, the long-term strength (at 90 days) was detrimentally affected when SMCA was present within either PC or PCfPF A blends. Although the usefulness of SMCA in cement based materials has been demonstrated other factors, such as the presence of alkalis and chlorides in the pore solution, may limit its use and as a result further investigation is required.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available